Here is a piece of information. temperature vs. humidity vs. Sun vs. SARS-CoV-2. The study was conducted by a US government lab. The results were reported on 4/23/2020 at White House Briefing (1). The study goal was to check the effect of heat, humidity, sun on SARS-CoV-2. Click on the picture to see the virus' half-life time after different treatments.
For understanding better, watch the White House Briefing (4/23/2020) [website below, starts at position 18:50].
1. Website for White House Briefing 4/23/2020: https://www.youtube.com/watch?v=b16H9Srwdew
There is a greater correlation between the parameters of the weather, climatic zone, season, climate change, etc., and various comorbidities (in relation to the Covid-19 disease caused by the SARS-CoV-2 Coronavirus), including various diseases of the respiratory tract, cardiovascular system, etc. than between Covid-19 disease itself. The impact, the correlation is therefore greater in an indirect rather than direct perspective. Best wishes,